Add AIX support to reboot module (#50353)

* Add ability for reboot module to work for AIX

* changelog for AIX reboot support

changelogs/fragments/reboot-add-aix-support.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - reboot - add support for rebooting AIX (https://github.com/ansible/ansible/issues/49712)

lib/ansible/plugins/action/reboot.py

@@ -46,6 +46,7 @@ class ActionModule(ActionBase):
         'solaris': 'who -b',
         'sunos': 'who -b',
         'vmkernel': 'grep booted /var/log/vmksummary.log | tail -n 1',
+        'aix': 'who -b',
     }
 
     SHUTDOWN_COMMANDS = {
@@ -62,6 +63,7 @@ class ActionModule(ActionBase):
         'solaris': '-y -g {delay_sec} -i 6 "{message}"',
         'sunos': '-y -g {delay_sec} -i 6 "{message}"',
         'vmkernel': '-d {delay_sec}',
+        'aix': '-Fr',
     }
 
     TEST_COMMANDS = {